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In making an alloy, a substance of specific gravity ${s_1}$ and mass ${m_1}$ is mixed with another substance of specific gravity ${s_2}$ and mass ${m_2}$; then the specific gravity of the alloy is
  • A$\left( {\frac{{{m_1} + {m_2}}}{{{s_1} + {s_2}}}} \right)$
  • B$\left( {\frac{{{s_1}{s_2}}}{{{m_1} + {m_2}}}} \right)$
  • C$\frac{{{m_1} + {m_2}}}{{\left( {\frac{{{m_1}}}{{{s_1}}} + \frac{{{m_2}}}{{{s_2}}}} \right)}}$
  • D$\frac{{\left( {\frac{{{m_1}}}{{{s_1}}} + \frac{{{m_2}}}{{{s_2}}}} \right)}}{{{m_1} + {m_2}}}$
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